What phase are we in now then?
Phase 1 and Phase 2 were free mods of CFS3.
Phase 3 was the first payware stand-alone "Over Flanders Fields" (which already gave me countless best hours of my life!)
"Hat in the Ring!" was the first add-on.
Phase 4 is the now actual stand-alone "Wings over Flanders Fields"
The additional set of skins and the Eindecker set are the first add-ons for it.
It's still the same Great War (which was before they began to number them), but even sooo much improved air combat.
Whatever the next add-ons of Phases may bring - I find it easy to give the devs all the time they need.
"WoFF" will keep me well entertained and occupied until then.