In reply to SOUTHERN GRAY:
I'm afriad I don't have any updated hut information for you--mayve call the Tschierva or Diavolezza hut and ask them if they have a contact?
Two other quick things:
If you're aiming for the Biancagrat it's likely ice this time of year...somewhat more technical tools, some ice screws, and time planning to accomodate pitching parts of the ridge might be reccomended.
This July, the normal route on the Palu (or the descent if traversing from the Marco e Rosa was in crazy condition...huge unstable seracs, big gaps, labrythine paths...very chaotic and dynamic, in some ways the most objectively dangerous part of the whole Pernina/Palu traverse, and a big contrast to other years I have been there.
The Go Vertical store/guide center in Pontresina usually has up to date information.
All best.