SGA help?

[twasadark]

Okay, so I just watched Stargate Atlantis's 1st eppy of Season 5 and I am TOTALLY in the dark.  Cause I haven't watched all of S4 and because I'm too lazy to search the webz for answers to all these questions ... maybe someone can hep me out?  Questions under the cut since they are spoilers ...

• Teyla and John are dining together at the beginning, even if only in John's mind.  WTF?  Are they getting together????  Which would actually thrill me. :-)
• How the hell did Teyla get preggers???  Well, aside from the obvious insert slot a into tab b stuff.  Did she get captured or something?
  
• The promo for next eppy showed CARSON.  Uh ... I thought he'd been blown into smithereens???

I totally dug Hurt!John even if his face did look smeared with clown paint there at the end.  And Ronon, yum, big strong Ronon carrying Teyla and the baby and not seeming to mind the ... um ... drippiness of carrying a woman who has just given birth.  LOL.