Some info here:
http://singletrackworld.com/forum/topic/sauze-doulx-anyone-know-when-the-lifts-open-for-the-2013-summer-season
Bardonecchia is the main centre with a choice of three lifts. Note they will only all be open at weekends until August. Sauze will open at weekends and possibly randomly during the week.
You can also nip over to France (via the Clarie valley) and ride Briancon from a Bardonechhia base.
All the lift assisted ‘Bike’ resorts are accessible from Sauze or Bardonnechia. Prali is a bit of journey, but still only a couple of hours from Sauze.
I can’t comment on the XC venues as I’ve never used them.
I’ve said it before, but I’ll repeat it again:
CHECK WITH THE LOCAL TIC BEFORE SETTING OFF TO ANY VENUE.( This is Italy – open means ‘maybe’).
Hth
Marko