WARNING, There's a SPOILER. What I suspected happened, but it definitely looks to be a spoiler @ 2:50ish. Something that hasn't been shown in previous trailers.
Seriously, don't watch.
I need webm's.
Than final transition shot with Big Boss. Outstanding.
How spoilery?
For those wondering about it, the first half of the trailer is just running through the previous MGS.
From 2:45ish on is new stuff from TPP (i.e. spoilers)
How spoilery?