So most likely there is some new boxing going on, but could also mean that the Falcon could possibly become a dual kit with the Wave Serpent. Either way the model is not being discontinued, but could mean that getting a Wave Serpent, could be a little tougher for a little while.
On the GW site
Availability:
This product is expected to despatch in one to two weeks.
Part Code: 99120104023
via Kroothawk on Dakka
I can confirm that from July onward, the Wave Serpent is mail order only. No idea if it will be repacked later.