Next Orange box engine capabilities
I've heard Gabe saying too that the episodes should be HL3 instead of HL2, but it sounded too much as marketing for me (oh look how new and improving it is). It has some improvements, but I have no trouble calling it Half Life 2 Episodes, I think I would find it strange if they would have called the episodes Half Life 3.
It?s good as it is and just call the next one Half Life 3 
Dynamic gravitational orientation please.
Quite so! It wouldnt be too hard to implement either...unless they have seriously stuffed up the way they calculate gravity already.
I would love to see an overhaul of the lighting system, though that probably won't come until the the HL3 engine.
I doubt Valve will ever abandon Source, and really why should they? With Steam they can make changes to the engine and update it, and have it work for every game they've made. Odds are they will just keep adding to Source and updating it, and won't ever make a "new" engine in the sense that we are used to.
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That made me laugh. A lot.
Thats the problem though, the really impressive changes happen when engines are rebuilt.
If we don't have a Source2 engine in the next 5 years then...then I'll eat Shmitz's hat .
A new Alone in the Dark 5 tech demo was released today. I'm not a huge fan of some of the gameplay, but dang, it shows off just how archaic Valves lighting engine is.
Gameplay looks a little, well, off but dang those real time lights are nice!