Just got back from a visit to ARES website and found that the noted release date of "April 2019" for Series 1 Reprint shows on their calendar as May.
Additionally, the next WGF release (Series 4) is noted in their press release as available in 2nd Quarter...but does not show up on their "Upcoming Releases" through the end of July????
Finally, from their description of T&T et al the Nieuport 16's are listed as Navarre in T&T only, with Ball's 16 (with rockets) standing as an individual plane pack.
Either way, still don't find any news about the balloons!