What do you think will happen with jim & pam on the season 4 finale of the office?

i am pretty sure jim will propose. do you think she'll say yes? on the promo it shows her hugging him, and it's been confirmed an office couple will get engaged before the end of the season. there aren't realy any other couples, are there? andy & angela i guess but they haven't been together that long. i am pretty sure she'll say yes, but you never know- there's supposed to be a big twist!!! please please tell me what you think! so excited for the finale- please share your ideas!! <3