You don't have to make any tests.
I haven't seen any starters
I haven't seen any starters with updated cards so I'd assume that the starters include old cards (statcatds and some resources) or none at all. Not that the resources can become obsolete - you can use anything as resources (I've seen people use dice, old Doomptrooper CCG cards etc) so old versions of resources will be just as good as the new ones.
Each starter already includes character(s) so you don't need anything else to play a small game.
For advanced games you'd need the combat deck:
http://shop.prodosgames.com/books-cards-tokens/281-warzone-20-advanced-c...
But as the name says it's for advanced games so I'm not sure if it would be a good choice for games with just starters. Better get more units first.
Prodos have also announced two 2-player sets to be released withn the next 3-5 months but they've had delays in the past so you'll be waiting for them at your own risk.
For advanced games you need
For advanced games you need to get the new deck. That's the only new thing you need to come back, provided you have the models and don't want to stay with the basic version of the game. Old cards are obsolete, now we have the same deck for all factions (each card has two two ways to be played, mostly it's one available for all factions and one available for only one faction).
Yes, the rules are straightened out. Not 100% perfect, but I've seen no wargame with perfect rules clarity. I'd say the current WZR rules are no worse than anything else in the market (probably better than most). It's worth noticing that the authors keep axplaining the rules of FB and here on the forum so you can get in touch with them.
Rules are available for download for free just like before. If you want a printed copy and don't want to invest in HC, there's a smaller and chaper "core protocols" SC version (just the rules, no fluff).
So my recommendation is: download the new rules, try them with the models you've already got and then decide if it's worth investing. Personally I think it's an enjoyable experience, not 100% perfect, but good enough to spend some time and money on it.
Template weapons ignore the
Template weapons ignore the power shot rule - check shooting with template weapons section. So all Hatamoto should've rolled their saves.
#1 You got it right. However,
#1 You got it right. However, if a model has greater size (by 2 or more than the enemy it is engaged with) it isn't limited to 1 action point when activated so it can move away first (or kill the opponent in CC) and then shoot with the remaining action.
#2 Cartel symbol means that any faction can use the effect described under this symbol. If you can use effects described on both sides of the card, you choose one.
It says ignore all negative
It says ignore all negative RS modifiers, so that also means the -2 RS for long range between 12-18 inches. I see no reason to make an exception
Yes, it is very powerful
Yes, it is very powerful (maybe too strong, but I haven't faced Alakhai often enough to tell for sure). Then again, Alakhai has WP 18 so even if there was a test it wouldn't have made much difference.