Bitcoin is not yet ready for a large company such as PayPal unless they go through BitPay (And I doubt BitPay is ready for that many PayPal transactions).
The solution Bitpay offers is trivial for Paypal. I mean no disrespect but Bitpay is a 2 or 3 person startup without any unique technology or skills; thats definitely the "easy" part particularly for a company with such resources and that has more experience with merchants accepting online payments, shopping baskets, interfacing with banks etc than anyone else in the world.
The difficult part is the selling, or possibly buying of bitcoins. Bitpay doesnt do that, they use the same exchanges we do. Is MtGox ready for Paypal? I would say they are not. If paypal/ebay were truly serious about bitcoin, they would have to start their own exchange; or buy MtGox and make it work. I dont think anyone sees them go quite that far and help and lend credibility to what is an opportunity but also a grave threat to their business.
In short, I dont think paypal will do anything with bitcoin in the short term. Long term, only if they feel they have to and if the ecosystem around it is mature enough. But the fact they arent laughing at bitcoin sure is good publicity.