First off, the whole hundreds of regenerations thing is such a footnote and general passing comment in SJA that I don't hold it as truth. I see it more as the Doctor just being like "Yeah, whatever kids." and throwing a random number out there since he didn't have time to sit down and explain it.
As for the Death thing... I'm more impressed that, unless they change the future, that Matt Smith will be The Doctor for 200 years, which implies a number of things, that Matt Smith is intended to be the very last Doctor before they end the series, that there will be a huge jump in time between the seasons at some point since we're obviously not going to see 200 years of Matt Smith before he retires from his role, or that the Doctor's "death" will be something that is prevented in this Season, or that isn't actually the Doctor who died, or whatever.
As for the pregnancy thing... I found it so weird how Amy was like "OMFG I GOTTA TELL YOU THIS RIGHT NOW!" didn't make any sense, made me keep wondering if the Doctor and Amy had sex at one point, which I recall they DIDN'T and I doubt they'd add that bit of stupid drama to the show (the Rory doubting her stuff is equally annoying.) Here's my theory... that somehow Amy's child is not Rory's but actually the TARDIS'. Not sure how exactly, but that's my theory. Sort of like when Rose was all uber in the end of Season 1, that's what the kid reminds me of. I mean, they already stated she was powerful to get out of the space suit. I'm guessing that she's a living TARDIS somehow, because I would imagine she travels through time with her own body since there aren't two blue police boxes floating around.
Back to the Doctor's death. Everything implies that Dr. Song is responsible for the Doctor's death. In Season 5 they imply she is in prison for killing the most important man in the universe, which is obviously the Doctor. The fact he dies to someone in a space suit reminds me very much that her first/final appearance ever was in an episode full of people in space suits, including herself. I'm half expecting it to NOT be her and have some other excuse, if only because all signs seem to point to the fact that they're married and that she's the killer. It can't be that obvious though because it's NEVER that obvious. It'll be interesting to see how that all plays out.