Yes I've waited for this for a good while.
Good questions Dimitrioptimus
(#1) I don't think we will see 7.5 amps at the tail cap, but it will all depend on the boost circuit of the driver, how many batteries are used and what brand of batteries used and if they are fully charged or not. Once again it will depend on the boost circuit of the driver but 7.5 amps works out at 1.5 Amps per T6 emitter aprox 2750 otf lumens, it does not sound like much but that's still 4.5 to 5 amps more then the good old TR-3T6 3 x 18650 and 2 x 18650 that are very bright.
I expect this to be like the other regulated trustfire multi cell lights, the maxium current draw is not always reached with fully charged cells, like the oringinal TR-3T6 3 x 18650 it's a 3 amp max driver but you get 2.4 to 2.9 amps with 2 fully charged cells (depending what brand you use) but as the voltage of the batteries drop the amps increase, but the driver will not let it climb over 3 amps.
In this case the new trustfire 5 x T6 will not get above 7.5 amps. This is where the old sky rays whent wrong as the battery voltage wore down from use the current draw climbed to around 5 amps to much heat and current for what the light was made for (3 x T6) so a lot failed, this is why I loved the TR-3T6 even though lux readings where a little bit under the sky rays.
(#2) I would expect run time to be less then the TR-3T6 on 3 x 18650's as there is more current draw, but like the TR-3T6 the more batteries you put in the higher the voltage is, this means lower current draw, so run time is increased as it would not be drawing 7.5 amps on 3 fully charged cells imo. You can also run 26650 lion batteries in the new trustfire 5 x T6, they can handle higher current draws and normally have a mAh rating from 3000 to 4000 + mAh so this would increase run time on the torch say over 2400 mAh 18650's.
(#3) Even at the maxium of 7.5 amps current draw that works out at 2.5 amps per battery when running 3 cells, but as in answer number (#2) the current draw would be even less per battery when running 3 cells going from the other trustfire multi cell lights. The trustfire flame batteries I've tested will do 3 amps no problem, but the torch may draw up a max of 3.75 amps per battery when running two batteries only but the batteries would have to be near empty and needing a full recharge to get that high of a current draw in my opinion and the torch should dim and not let you change modes around then to let you know it's time to change batteries.
The current draws ive given is just aprox math basicly guessing as I need to test the torch and I only ordered it yesterday, but it should be close but I have had a very hard couple of nights..... If your worried about current draw or run time issues you can use 26650 Batteries as they can take from 5 to 30 amps each come in mAh from 3000 to 4500 they cost from $5 to $25 usd. Good ones can be had for under $10 usd each with free shipping if you order 3 or more.
There is one draw back from using 26650 batteries that most are not protected, but the torch is ment to (claimed) have a low voltage dimming circuit to lock out high and medium mode as a low battery voltage warning, the TR-3T6 and TR-1200 do the same thing, do not keep running the light past this.
I have ordered 3 x 4000 mAh 26650 king kong batteries for $26.70 usd as I'm not worried about battery protection for myself. I'm also looking at some 4000 mAh protected trustfire 26650's for $22.80 a pair. I'm thinking the 26650's are not needed really 18650,s will be fine and if you have 6 even better, but just remeber this light has 2 more led's and a more powerful driver so don't expected the same run time as the TR-3T6 on the same batteries.
Now some of this post (long winded dribble) is speculation as I have not tested the light yet and I'm very very hung over, but I hope the post helps and I'm sure ill be corrected if I'm wrong.