1. The information posted on the MS forums seems to be quite accurate.

  2. There will be a public beta of the upcoming avast for WHS product. The current plan is to have this released by the end of September (if everything goes as expected).

  3. It won’t be stripped-down version of Avast Server Edition. The remote admin features of the WHS product are being developed from scratch (the requirements are sort of different from the usual network admin so the product needs to look differently; also, in the case of the WHS product, the GUI will be integrated directly to the WHS console).

  4. In the interim, Avast Server Edition (trial version) will give you adequate protection of the server - but won’t provide any remote admin functionality.

I hope this helps,
Vlk