Front end wobble can be caused by many things...basically when you take your hands off the bar, the natural dampening you impart on the oscillation is gone so any induced oscillations if not damped by the friction of the cables and wire routing, worn tire tread pattern (it imparts friction losses when contacting the road) as well as preload of the steering bearings/fall away adjustment will all contribute to those necessary losses. The key here is to check the air pressure and tread wear condition of the front (and rear tires). Did you add some recent service/accessories...that would change weight distribution or on the front fork/handle bar loading?
Rockysky, you bought up the new tires...it may be something simple like the wrong tread pattern for "your bike" or when the servicer installed, they got the alignment or balance a little "out of wack". Do have the dealer re-check their work and double check fall away and steering preload and cable routing just to be sure.