You may have noticed that lending is not currently available this morning on Prosper. Prosper is pausing lending activity due to the SEC filing. They are looking to add a secondary market to the loans, this will allow lenders to buy or sell loans after they are funded.
This could allow you to 'cash out' if you want to sell off your loans and get your money out, it will also allow lenders to free up cash for current bidding. Prosper will have more info when the filing process is complete.
If you're a borrower with an existing loan, you still are bound by your borrower agreement and will be unaffected by the process. If you are a borrower seeking funding, you are able to create a new loan listing and Prosper will attempt to fund it through alternative means.