I just got back from Orlando - flew SW for first time since the change. Talked with a ticket agent at length about the new procedure. She told me that the 3 locations (skycap, ticketing, departure gate) all pull from a central pool of A tickets until there are 5 remaining at which point the five that are left default to the departure gate. So, you always have a better chance of getting a ticket at the departure gate.
We always get an early flight, which is SW's first flight of the day. So, since ticketing didn't open until the 90 minute point and there was already a big line, we checked our bags at skycap at the 2-hour mark and went straight to the gate. Hardly anyone was there. So, when it opened at 90 minutes to give out boarding passes, we were first in line, no problems.
So, basically, for me - the motion-sickie, my process was same as it always was. Get there 2 hours ahead, check bags, go to the gate and pick up a boarding pass there, then get in my 'A' line. Not as good as picking a seat ahead of time, but it worked out fine and I didn't get sick because I got 2nd row of the plane.
So my advice to those who *need* to sit in front to avoid using the barf bag

, arrive 2 hours early, check bags with skycap, and proceed directly to the departure gate.
Tara