Deer Valley closed on its purchase of Solitude Mountain Resort in May and announced they would replace the Summit double with a new Doppelmayr detachable quad. The new Summit will be in a new, longer alignment that is easier to access from Apex Express. I checked out the progress last week.
The old lift is completely removed and stored in the Moonbeam parking lot. It looks like the Thiokol double will be used elsewhere (the last lift Solitude removed ended up at Canyons Resort.) Trees are gone from the new lift line and a lot of earth work has been done although nothing has been built yet. Highlander Ski Lift Services appears to be building the new quad. With 13 new lifts projects and counting, Doppelmayr is stretched pretty thin. I did not see any parts for the new lift but I am sure they will be arriving soon.