Alberta Party is centrist and currently holds a seat in the Legislature in the form of Dave Taylor, former Liberal member and former contender for Liberal Leadership.
NDP and Liberals in Alberta would never merge, Brian Masse and Rachel Notle hate the Liberals as much as the PC's.
Ted Mortin isn't the front runner, isn't even close, he only pulled in 28% last leadership race, Gary Marr is the tentative front runner right now.
Guy Boutilier has already joined the Wildrose Alliance Party and is currently sitting in their Caucus even now, in fact his decision to join them gave them official pa