On 28/02/2015 13:24, Ulrike Fischer wrote:
> Am Sat, 28 Feb 2015 09:10:21 +0000 schrieb Joseph Wright:
>
>> There are other TeX systems :-) It's important we get some real 'opt-in'
>> testing done before sending to CTAN.
>
> I will try to do some testing and run real documents with the new
> format. This is rather easy with texlive: I have some scripts which
> I can use to prepend temporarly the texmf tree with the testbuild
> and the formats to the search path.
>
> It is a bit more difficult to do the same with miktex as the root
> with the normal formats is always at the begin of the search path
> and it is not so easy in my editor winedt to use simply another name
> for the executable. I'm still pondering what I could do there ... I
> don't want to recreate the formats all the time. (Probably I can use
> the --alias option but couldn't test it yet.)
>
>
>

One useful thing you (or anyone) could test without changing the format 
at all would be to take just latexrelease.sty from the test release
and then test documents with the existing format but start

\RequirePackage[2015/01/01]{latexrelease}
\documentclass{...}

The plan is that this would essentially "upgrade" you to 2015 without
needing to build a new format.

David