What I've learned so far:
1) To get access to Wallet send money option, you need someone who has it already to send you at least $0.01 (US Only).
2) Max that can be sent via CC is $9999
3) Normal CC fee is 2.9% but it's promotionally waved (not sure how long)
4) Tested sending $1k and received the following on my AMEX pending charges:
A) Google Wallet A

Another user from FT received:
B) Google Wallet TOPUP

5) You need to link your bank account in order to withdraw funds (much like AP).
6) Bank account verification isn't immediate so do it now... (2-3 business days they say)
7) Playcards do not add funds to your wallet.