Does Deployment Solutions 7.5 SP1 HF2 Support WinPE 5.1?

I understand (as of the most recent documentation that I have seen) that Deployment Solutions does not currently support Windows 8.1 imaging. However, will Deployment Solutions fully function using WinPE 5.1 for Windows 7 installations? I'm hoping that I could install WinPE 5.1 and use it instead of an older version of WinPE so that whenever 8.1 is supported the WinPE portion will already be prepared for the support. We currently only have a few Surface 3 Pros that are running Windows 8.1, but I like to plan ahead.

If WinPE 5.1 isn't supported, is WinPE 5.0 the highest supported version or should we be using 4.0?

Thanks.

Johnathan