Hello there again Mr. Connor.
How do the Titans and corvettes influence gameplay?
Corvettes made a truly interesting LRF counter and discourage blind capitalship rushes since they are fast enough to case down damaged caps from a battle. They also made expansion a bit faster since they are both fast and good against Siege frigates.
Most people agree Sins early game balance is a good as it has even been, with a nice little early combat square. Corvettes beat LRF, Flak beats Corvettes, Light Frigates beat Flak, and LRF beats light frigates. LF + Corvettes are the slightly preferred combo but I think it may come down to your race really.
Titans will be either a hit or miss thing for you. In multiplayer they've definitely changed things. Most titans have good damaging AoE attacks, and as titans are rebuilt at the level they're destroyed at you want to do everything possible to avoid unnecessary losses when fighting them. That means using ships that are either immune to their abilities or are durable enough to tank it, mainly your own titan, capitalships, strikecraft and corvettes. At low levels titans can be overwhelmed by numbers but once they get stronger they're quite formidable. Any other advice is really dependent on each individual titan, they are really do have some very different move sets and abilities.
How is game balance between the factions?
No worse than it was before Rebellion. Both Vasari subfactions have some really powerful unique reseach (Vasari Loyalists can eat planets to get a ton of resources, allowing them to zerg rush everyone with unbeatable fleets in under an hour, and Vasari Rebels can phase jump their starbases into other gravity wells), but both have been nerfed to be much harder to deploy in a multiplayer context. TEC and Advent Loyalists were considered the weakest two subfactions but a series of small strategically placed buffs give them their own niche. At this point I'd say if the Vasari didn't have phase missiles the TEC and Advent Rebels would be just as good as the Vasari.
What happened with multiplayer, is it still all 5v5s, or are there more smaller games than there used to be?
Still 3v3s to 5v5s depending on players in the lobby. I've found if I host 1v1s they'll fill quickly, but you usually have to make them yourself. Weekend player counts seem to have stabilized between 150-300 players, right after a sale or patch we'll see it rise to as high as 500, and I think ICO had a record of 1000 people online at one point.
Do my old maps still work with Rebellion or do they need updating?
Yes they will, but Harpo might have a tool to help with that as always.
One thing you'll like is the new "Competitive Maps" they added a few months after Rebellion released. These force each planet type to have the same amount of militia and resource asteroids, and planet bonuses and artifacts have been removed. Basically it takes some of the random luck aspects out of the game. They also added some new premade maps that support teams spawning next to each other (I know Triple Entente at least was one of them).
Is there a patch on the way?
Maybe some small bugfixes. A major patch, 1.5, and the first ever Sins DLC Forbidden Worlds was just released. Fortunately this DLC doesn't split the community, whoever hosts the game determines if the DLC will be used, even if not everyone in the game has the DLC.
When I last played the carrier capitals were the mighty units
Pretty much. They're still good capitalships, all of them, but Corvettes have made relying on say a double carrier rush way more risky since you probably won't be able to retreat them if you commit to an all out attack. Most people seem to have gone back to the old fashioned colony capitalship starts, though plenty of TEC commanders still go with the Marza just to get missile barrage ASAP.
Eighteen months later I have a brand new disc copy of Sins Rebellion with a brand new manual. That was a good decision, thanks guys.
Wait, did I miss something?
Edit:
AR now inferior to AL (others reading this correct me if I am wrong)
I preferred Advent Rebels to Advent Loyalists even when not using Wail of the Sacrificed. The main difference may indeed be whether you want the Eradica titan's fleet killing power or the Coronata's single super damaging attack. I'd pick the Eradica most of the time but they're both pretty good titans now.