Haven't heard anything about unlimited upgrade like most the airlines are doing, but that would a great addition. Regarding elite lines, if you're select+ you can go into the club acela and have the agents there take care of any ticket changes. Not having to deal with the normal ticket lines saves so much time, plus they announce the gate in the club before doing so in the main terminal.

If you're not select+, for 15K points you add unlimited club access to your select membership -- basically they send you a new card with the "Club Acela" logo in the bottom right-hand corner. For some reason, they don't list this as a redemption option on their site -- I found out about it on flyertalk. I did this last year when I hadn't made select+ yet, but beware it took about 6 weeks for me receive the card...