From what I have heard RPM literally has no requirements anymore. And to me I'm not sure if I like that. This means that they will have huge influxes of partners and I'd assume you'd have a less personal relationship with the network. Networks to me are supposed to be your partner and help you achieve something greater. Just giving you a banner doesn't do this, the network has to offer more.
As for your question, until you sign the agreement you are not locked into any network in particular. You can say yes all day but until you sign the legal documents you have the ability to do what you want.