Top 5

[Jacob Carlborg]

I thought that would share my list

1. The Tango/Phobos issue
2. Stack traced exceptions, add it in the language and the specification
3. dmd on osx (but will not happen)

Unordered:

Be able to use versions the same way you can use bools, like this:
version ((linux || darwin) && (PPC64 || X86_64))
version (!Windows)

Property shortcut:
public get set int foo;

"Reasonable varargs that don't require either horrible
platform-dependent machinations or massive code bloat."