No you cannot play it atm. There is a game module planned to come out "soon" (Q1 of 2015) which the Founders will have access to. So if you want to play as soon as possible get yourself a Captains pack.
I don't think it will be as simple as that. I think the ork slot that you get with the pioneer bundle will be restricted and not be granted the same level of access to items and such as an ork character created on one of the founder character slots. " ...the rest of the Ork progression will be unlockable through the store at your discretion."
About buying a Pioneer pack while already being a founder; I bought it, and though the payment authorization is still open and my Pioneer pack still isn't applied, one of my 4 character slots already has a faction limitation. For some reason while nothing of the Pioneer pack is applied to my account I already have a faction restricted character slot. Whats up with that?
a squig pet is just not worth $15 never liked getting nickled and dimed. Still think fundamentally the pack should not exist. you aren't giving the player anything other than skins. That something I expect out of a mobile game... Its that all too familiar knee-jerk reaction when a certain amount of ppl in a gaming community say that old tired quote "shut up and take my money". Please don't go "whale" hunting B.E
so you would prefer they sell power and destroy the gaming experience for anyone who isn't willing to shell out hundreds of dollars for power upgrades? get lost