People are talking about schedule 3 needing a prescription, etc. From the financial point of view that's irrelevant; the point is that you CANNOT legally sell schedule 1 drugs commercially (with some exceptions that I can't remember).

Schedule 1 -> banned from the financial system.

Schedule 3 -> OK to use the financial system.

How the DEA schedule and the financial system interact is still unclear. The important part is that once regulations are updated weed businesses won't be restricted from access to the financial system. There may be some more regs around that access, but I'm sure they'll be worked around.