Formally you’ll need to show an onward ticket within 60 days, some days accommodation and funds equal to 20K baht in cash. This is rarely checked at the immigration, but you might risk that your airline will ask to see an onward ticket within 60 days during check in. So in case you plan to stay longer and apply for an extension in Thailand you might need to buy a cheap ticket out within 60 days anyway. If your return is within 60 days is of course no issues at all.
As said this is supposed to be a pilot program just for Australians for six months and it could start in December but it seems to be delayed. Last news is that it's postponed indefinitely while they figure it out. The day it will affect you, you’ll know.
Visa exemption is now for 60 days for all 93 countries entitled.
Ok, that’s what my Bank told me, but I guess it can vary between branches. Anyway if any problems, an agent will have no issues open a bank account for a person on Non Immigrant visa.