I think that the r1pro is only good for 3S, although this may just be because of the bec. I wish that something would come out, either the Tekin or the Castle.
I believe he has said that all the Tekin BL ESC's will do up to 5S, but they only spec 3S because of the internal BEC. They don't want to have to explain that they will run on up to 5S if you disable the BEC and use a UBEC or Rx pack.
In my business, the rule of thumb is the first product to launch usually takes the market, given they are of similar price, features and quality. I would bet much of the same applies here. If one is months behind the other and doesn't offer signifigantly better features, they will have a difficult time penetrating the market.
It should be an interesting race to see who gets it done first. Like many of you, I will be eagerly waiting for any reasonably priced controller that will be capable of reliably running 5S on a 1/8th scale/ MT setup, and is supported by good CS.