FW : 2-2.5 M
LT : 10 M
it will be the best selling UC game

I dunno I think it can outsell 3. Just look at what the Uncharted remaster collection did on the PS4, everyone is ready and the hype is huge. As long as it has a high meta then I think it will easily outsell 3

Uncharted Collection on PS4, acording to VGChartz, nearly out-sold Uncharted 1, so i bet that the game will break 10 Millions Life-time, just like The Last of Us, did.

This!

Uncharted 3 was still a solid game in its own right, I dont think it was far behind Uncharted 2, you're always going to have one game in a series that is better than others. I can't think of a single long running franchise where each and every squeal has been better than it's predecessor.

I am more reffering to the fact that one would exect a huge growth after Uncharted 2 it's succes just like Gears of War. Point being I think this series has reached it's peak points since there are only a select number of gamers which are really intrested in this type of games. Mostof them are on PS considering Tomb Raider sales. But I don't think there are more than let's say 7 million gamers out there which actually really want Uncharted 4 without mass bundling that is.

Well technically bundling played a gigantic part in that to be fair, especially during holidays

I'm optimist and i will go with 2.5 million First week.
10 million lifetime.

First week: 1.8-2M
LT: 9-11M

I'll be a bit more conservative with it's first week, so 1 - 1.5 million FW. Lifetime I expect it to eventually become the best selling game in the series considering the hype, provided it gets good reviews. Lifetime around 8 million.