Original PA is still supported and will continue to get bug fixes / engine updates and has also gotten the new audio stuff and UI changes from Titans. What you won't get is the new units. As for multi player, Uber have set it up so everyone can see all games. Titans players can simply join original games (so if you want some multi player games with / against me for example, you host I can join, no problems). Titans owners can also specifically chose to host original games if they want (an option in settings). Obviously players who don't have Titans can't join Titans games because they don't have access to the new units. Whilst some are concerned that 'no one will join original games now', that's not been my experience. I would rather join a decent looking game than wait ages especially for the Titans game (and actually, the Titans, especially the orbital one, kinda screw the balance a bit currently anyway).