MBP refresh - likely memory type?

[Hades]

I'm considering upgrading the menmory in my MBP 13 to 4gb or possibly even 8gb. The latter is obviously very expensive so I'd want to be sure that if/when I move to a newer MBP the memory would be compatible.

Does anyone have any thoughts on whether the current memory is likely to be carried across to the refresh? I realise no-one knows for sure but what would an i5 MBP use?

 

[Hades]

For virtualisation. If I replace my main machine then I'd be running several OS's side by side.