Wasn't there a major fire at one of their meat plants recently? ... other than that, and occasionally driving past their property at Appleby (?) and the QEW, I can't say I've heard of them.
My guess is that they probably don't have the cash on their own and would probably need at least one or two very wealthy partners to make this happen.
Also, even if the plan is to build the arena near a GO station, Burlington is far from an ideal place for an NHL arena. Like most highways in the GTA, the QEW is a mess during rush hours, and I can't see the business crowd (needed for suite sales) making the trip from Toronto or Mississauga.