A more detailed spoiler should be up soon, but right now, this is what nbcmv.com has...
The One With The Secret Closet"
WILL IT BE A FAR, FAR BETTER THING FOR JOEY TO BACK AWAY FROM ROMANCE WITH RACHEL? -- When a concerned Joey (Matt LeBlanc) takes a pregnant Rachel (Jennifer Aniston) to the hospital when she's in pain, he realizes his intense feelings for her are excluding Ross (David Schwimmer) from the joys of impending fatherhood -- so Joey makes a gallant, if reluctant suggestion that could change all of their lives. Elsewhere, Chandler (Matthew Perry) is obsessed with finding out what's behind the locked door of Monica's (Courteney Cox Arquette) forbidden secret closet while Phoebe (Lisa Kudrow) convinces Monica to submit to her massage -- then regrets it when her newfound client responds in ecstasy with suggestive grunts and groans.
I am guessing from many hints I have heard on Angel's, that the big decision in the episode will be...(this is just my guess-possible spoiler)...
Joey, feeling guilty that he is somewhat stealing Rachel and the baby away from Ross will suggest that Rachel move in with Ross so both of them can raise the baby together (well, not together romantically, but together as parents). This is also a spoiler of the sex of the baby from someone who went to the 814 taping (spoiler below)...
The baby is a GIRL! They mention this a couple times in 814, but apparently we learn this in this week's episode!