Oh boy. I thought this was billed as the season where answers began to come out.
Hah. My questions in the extended entry. Meanwhile:
Ryan’s take.
Alan Sepinwall’s take.
Entertainment Weekly’s take (not yet posted at 2115HST Tuesday night).

Claire appears in two timelines?
A new set of baddies thinks Sayid’s “claimed” by something they don’t like — Jacob, you think?
And who the hell is/was Jack’s sister? I’ve forgotten, but I know she turned up a season or two ago. Oh, yeah. Claire, of course!