All this info I got from watching the Special Talk Session. I realize all this could change by the time the game is actually out.
-Yoshi's DRG has several weapon skills that take TP
100
100
110
120
150
200
200
-While in combat with enemies your TP regens at a rate of 30 tp ever 3 seconds.
-Out of combat your TP regens at a rate of 100 tp every 3 seconds
-There is a 3 second global cooldown for weapon skills.
-Combos now require TP for the 2nd WS and onward.
Single target boss fight
Using high TP cost WS, then low cost once my initial TP is gone.
Time | TP
0:00 | 1000 -200 = 800 TP
0:03 | 800 + 30 - 200 = 630 TP
0:06 | 630 + 30 -200 = 460 TP
0:09 | 460 + 30 - 200 = 290 TP
0:12 | 290 + 30 - 200 = 120 TP
0:15 | 120 + 30 - 150 = 0 TP
0:18 | +30 = 30 TP - No WS used
0:21 | 30 + 30 = 60 TP - No WS used
0:24 | 60 + 30 = 90 TP - No WS used
0:27 | 90 + 30 = 120 - 120 = 0 TP - 120 WS used
Once you hit the bottom of your TP bar which happens 15 sec into the fight there is a 12 sec wait before you can do anything again. Causing a 9-12 sec wait to do another WS depending on how low your tp went.
Try using exclusively low cost 100 TP WS
0:00 | 1000 - 100 = 900 TP
0:03 | 900 + 30 - 100 = 830 TP
0:06 | 830 + 30 - 100 = 760 TP
0:09 | 760 + 30 - 100 = 690 TP
0:12 | 690 + 30 - 100 = 620 TP
0:15 | 620 + 30 - 100 = 550 TP
0:18 | 550 + 30 - 100 = 480 TP
0:21 | 480 + 30 - 100 = 410 TP
0:24 | 410 + 30 - 100 = 340 TP
0:27 | 340 + 30 - 100 = 270 TP
0:30 | 270 + 30 - 100 = 200 TP
0:33 | 200 + 30 - 100 = 130 TP
0:36 | 130 + 30 - 100 = 60 TP
0:39 | 60 + 30 = 90 TP - No WS used
0:41 | 90 + 30 - 100 = 20 TP
0:44 | 20 + 30 = 50 TP - No WS used
0:47 | 50 + 30 = 90 TP - No WS used
0:50 | 90 + 30 - 100 = 20 TP
After 39 seconds you start to get TP starved and have 9 sec wait between WS. In a real fight you probably wouldn't be exclusively using your 2 weakest WS.
Now for short fights like quest mobs this is fine cause they don't last long at all and you get out of combat and get that 100 TP regen. Makes it look like the system seems great. However we didn't see any long boss fights. This only seems to be an issue with mobs that last longer then 30 sec. Although there might be abilities to regen tp perhaps? Guess we will see in beta how this plays out.
After you run out of tp once it seems to stuffer from the same problem they had with stamina where people would be sitting around waiting for it to fill up then hitting their button. Hope they do something about this.