I think we will not release the final version before May. Although this beta version is pretty stable, we should wait at least one month for testing.
RC2 will follow the same subscription scheme of RC1 and Forest 4, so all customers with active subscriptions will receive it without cost. Since each new license includes a year of subscription, you can purchase it now if you like.
Probably we will adjust prices for the new release, because we have not modified our price list since long time ago. But in any case, it will not be a dramatic increase. Perhaps 10 Eur more or so.