i have never had floor seats before but im guessing its your best chance to get up close instead of lower upper level (youll never get close to the stage all the way up there)
im pretty sure its first come first serve, obviously the sooner you get online to get tickets the better your chances are for getting good seats. sometimes if you wait a few mins someone "throws" back tickets they had holding into the pool to choose from and youll get those good seats. sometimes its a matter of luck but again if it were me id be online right at ten am.
i have seat numbers on my tickets so its not general admission and there will be seats to sit in (but really who will be sitting in their seats?? haha)
i really couldnt tell you what tickets will be left for general sale but im thinking there will still be a some good seats left from but since they go fast youre better off trying early.
for instance-- i was online right at ten am this morning for presale tickets. first search (i was on two computers) i got UPPER LEVEL SEATING! i searched again and got floor tickets.... then i searched on the other computer for a better section and kept getting lower level. i bought the floor seats i had. when i got home from work at 530 pm i searched online again for presale tickets with another code i had out of curiousity to see what was left and i got floor seats a few rows behind the section i got this morning, and i tried a few times getting the same exact tickets. i was surprised floor seats were still left.
so hope this info helps. i rambled on quite a bit..... haha what else is new