Since the game engine needs to be apparently rebuilt from scratch, does that mean that content from 2.23 and down will not work with the as yet to be done new game engine?
The game engine isnt being rebuilt as of yet, they just tore out the physics engine, So theres going to be a change in that. ODE will be put in, or is being planned to be implemented. It's a wonderful physics engine. I'm sure it will be put in as clean as possible so as not to disturb games made with previous engines. For example, when I loaded my game in Nikotesla's windows build of 2.25b, the ship didnt move, but Dloc worked etc... So pretty much that just needs to be fixed up. Everything else worked. All we need now is patience
maybe a month or two.
Have you ever looked at the Nebulla Device? They have a gpl collision system. I've never used it though. http://www.radonlabs.de/