Somehow this slid under my radar: Civilization Revolution 2 exists, a sequel to 2008's Civilization Revolution, and it's available as I'm typing this for $15 on the iOS App Store (with an Android version to follow later this year).
It's hard to know what to make of it, since it had so little pre-release press. Who devised this stealth-sequel anyway? Firaxis?
Not this time. Firaxis designed the original, which shipped for consoles first, followed by mobile phones and Nintendo's DS later. 2K China handled the iOS port of that original game, and it seems they're in the driver's seat for the sequel. That may be neither here nor there, but if you want to scan their development history for yourself, see here. They're mostly known for doing ports of games someone else created.
2K's standalone Civilization Revolution site makes no mention of the game (in fact, the page hasn't been updated in years). There's an official sub-site for it off the trunk Civilization site, indicating what it's compatible with (iPhone 4S+, iPad 2+, iPad Mini 1+ and iPod Touch 5) and offering this description (my emphasis):
The sequel to one of the most successful strategy games on mobile is here! Sid Meier's Civilization Revolution 2 challenges players to build a glorious empire that will stand the test of time. This is the first game in the Civilization catalog to be developed and available exclusively for mobile devices. Civilization Revolution 2 offers mobile strategy fans a brand new 3D presentation and more tactical depth than ever before! Find out if you have what it takes to rule the world!
And then there's the feature checklist: a few new units (Aircraft Carriers, Jet Fighters, SpecOps Infantry), some new tech (Lasers, Medicine, Information Tech), new buildings and wonders (Nuclear Power Plant, The Red Cross, Silicon Valley), 3D graphics (the original mobile versions were 2D) and some history-minded scenario challenges.
The good news is that it's $15, not a buck or free plus in-game purchases. Once you've bought it, it's simply free-to-play. The bad news is that the game ships without multiplayer -- just as Civilization Revolution did, true, but the latter wound up getting it down the road for $2.99. If history repeats, that means Civilization Revolution 2 is really free-to-play-solo, with a pay-for multiplayer update to come.