This is actually a question worth a thorough poll. I guess they will not, especially as C3 art is not that substantially different visually from C2 and items are well compatible. This opens a number of potential approaches: slow replacement of all boxed expansions by C3 editions, re-releases of some C2 minis as C3, re-releases of some long time sought after C1 minis that never saw a light of a day as C2 now in C3 art etc. ... (I admit that the last option is more my wish than a probable scenario but ... who knows).