Looks like the new line of sleeping bags is on the Montbell website.
https://www.montbell.us/
Biggest change I see is the addition of bags with 900 fill and lighter weight shell material. Lets hope the retail cost is less than the list price, because there is no way I would pay more for a Montbell than say a Western Mountaineering. The bags however look pretty good.
Example:
Down Hugger 900 #2, $519.00, 12 Oz of 900 fill down, 1 lb. 8 oz total weight. That should make it a little warmer than a Western Mountaineering Megalite at the same weight (same amount of 850 fill).