So what exactly is coming with extended C++ support?

[Szymon Gatner via Digitalmars-d]

On Tuesday, 30 September 2014 at 14:19:51 UTC, Araq wrote:
>> It doesn't mention anything about moving C++ into C#.
>> Even with IL2CPP, C# has fundamental design trade offs that 
>> make it slower than C++(GC is just one of them), so it 
>> wouldn't make much sense to port engine code to C# unless they 
>> wanted it to run slower.
>
> What are these fundamental design trade offs?

Guys I beg you, is there any chance I will get my answers? ;)