In a certain sense, only two new features have been announced so far, but both of them are huge.
- RM8 runs natively on both PC and Mac.
- RM8 uses a has a new user interface with a modern look and feel and which uses non-modal windows (i.e., non-blocking windows)
I obviously haven't had a chance to play with RM8 yet, but the non-modal windows thing appears to be a very full and rich implementation of the non-modal windows concept. It might have been possible for RM8 only to nibble at the edges of improvements when it came to non-modal windows, but it looks like RM8 is all in for non-modal windows. If the non-modal windows implementation turns out to be as good as it looks like it is, it seems to me that all the advantages of this one improvement will be fully apparent only after using the product for an extended time period - weeks or months, for example. The support for multiple monitors which was demonstrated is just one of probably many, many usability improvements that will be provided by via non-modal windows.