Replying to you, since you were the loudest apparently, but don't feel offended please this is more for all people.
I can understand all the salt, some people put a LOT of work into their virtual car company and car designs, which all will be lost. But if you think about it - try using savegames from B293 or B433 - i don't think you will be lucky.
We, talking now as the side of the team, we beta-testers do our work so you can enjoy a MOSTLY bugfree experience, but we cannot find every bug. Some stuff is system-based, some other stuff is just user-cases which at times we don't encounter because of the ways we play, tried to keep the savegames compatible for as long as possible, but as you can think off its not easy to do so. A lot of stuff can change in background, for example if you add something new to the engine designer it CAN break the saves.
UE4 will get a major overhaul on the way it handles the luas and will be crafted into a database-oriented system with SQL-Tables. That increases speed a lot, and can give you - the player - massive benefits. Faster loading times, faster game response, better file management, less occupied space (maybe) and possibly fixing some savegame bugs that exist.
The graphical overhaul is another thing - yes for some people its just fancier graphics that need more PC-Power (which is not quite true - Automation peaks at 45fps ON A GTX1080 at Full HD. Calculations won't take any longer i suppose, can't be as slow as it is now.
The benefit of UE4 is - in my eyes - better graphics, better performance, better modability. The price is you saved models and car company - but lets be honest - in UE4 your cars will look much better. And if we get a full HTC-Vive support for engine testing - why the hell not - i would pay for a small VR-Addition, there are some people who would actually want that.
The engine thing, the FAQ says which are in and out. Stuff like I8/2/7, VR6 ( @Daffyflyer I bet you will enjoy making the different valve-trains for a VR6), V4/2, Boxer2/8 will most probably be part of a DLC.
Yes for your non-supercharged people it might suck not getting the V16, but people paid for it and its a early bird thing that some game companies do/did. On Prison Architect you also could get your own potrait, if you got in early enough. With the new semi-modular engines updates on that side will happen more faster, which will make you more happier!
@Killrob About the DX11 thing: Most PCs should have that nowadays. The switch to Vista/7 only already meant that "old" XP Bricks are out and that most people should be around with DX10 available cards. AFAIK on UE4 you don't need a DX-11 compatible card, but without one you won't have effects like tessellation, reflection environment, and sorted GPU particles for example. I read about people playing UE4 games on their old GTS250 - which is a DX10.1 GPU.
All in all great update vidoe as usual - really looking forward to the UE4 port
Also forgot to mention it - @zeussy aren't all engines effectively Boolean strings with the UE4 port? XD I5 must be!