Hell yes ^.^
Why don't you just name v9 - v10 ;P It doesn't matter much, but such a huge update wouldn't just upgrade it's patch number by one, for instance, WoW ^^
Anyways, about the era's. Sounds great! Why don't you include the Renaissance Era in the larger eras? I'm just asking this because of that era's Age of Enlightenment. Quite a lot happened during that era, anyways.
I'm avoiding the renaming purely because it will be a little while before the next major version comes out and there will be a variety of frequent updates to 8.9 in the coming days - and I don't really want to get up to v15 by next week. This also helps keep continuity a bit when I release v9 to the ModBrowser. The last version on there was v8 and I don't want people thinking they missed any of the substantial updates.
Currently I'm debating replacing the onset of Era's through Tech's with the onset of Government's. By having specific Tech's, (named after Governments), unlock Governments, rather than specific Era's, there will be more incentive to weave your way through the Tech Pyramid rather than just through unlocking era by era and always going for the next cheapest Tech.
Era's can also present the problem of sometimes being inaccurate. This is especially evident in vanilla CIV V where I've found it common to have tanks battling it out in 1500. In these instances, all era's do is hurt the overall immersion factor that they are supposed to add to the game in the first place. I think, in general, a CIV gamer knows based on the year alone when he is in the Medieval Era and doesn't need to be told this with a fancy graphic.
What are people's thoughts on this? I could introduce some new game mechanics if I take this route. For instance, currently entering the Classical Era stops Barbarians from spawning. Conversely, I could have Feudalism stop Barbarians from spawning. Monarchy, Theocracy, Oligarchy, etc - wouldn't stop Barbarians. There are numerous things like this I could add that would help each Government feel even more unique.
But to answer your question, the Renaissance is definitely getting expanded and will probably make up one of the larger portions of the game. The Renaissance Era will also most likely feature the most Science enhancements/buildings/improvements whereas early Era's will focus on Food, and then Gold and Production.