there have been HUNDREDS of new lessons since the old software version, all of it for players of intermediate to expert strength (written by GMs, IMs, and famous authors). you will not be disappointed! also, each month there are between 25 and 100 new lessons!
How much new material is in chess mentor compared to the old software version?
How much >1700 elo rated material is in chess mentor (the chess.com version)
Just curious, but I'll most likely subscribe to the site and chess mentor regardless =)