There is a fairly long promo loop playing on channel 4, promoting Pitbull and occasionally mentioning where the 40s programming went. The telling thing for me is all the promos are generic and refer to "Pitbull coming up on THIS CHANNEL" - stay tuned to "this channel for Pitbull's live concert on May 19."
A couple possibilities:
*SXM is just giving up (?)
*The people in programming don't talk to the channel lineup department so didn't know the channel number when doing voiceovers, and apparently couldn't be bothered to update them when they did find out.
*Maybe they were having a real debate about where to put this channel? It could easily have landed on 149, the former home of La Mezcla, but would have also fit into the Dance category.
*They could even have planned to initially put it in the 500s / only on SXM 2.0 and online?
I also agree with others' comments that it'll be interesting to see how this channel affects Venus one way or another. How many kinds of Top 40 do we need?