The plan offered by Lectrosonics allows owners of current generation products in these blocks, including SM Series, UM400-type, UH400-type, UT, LM-type, IM and MM400-type transmitters, and UCR411-type, UCR401, Venue-type, SR-type, UCR100 and R400-type receivers to have the frequency block changed to a lower range for a nominal fee.
AKG's offer is conditional in that the rebate can only be applied towards the purchase of their WMS 450 system:
...AKG announced a trade-in program for customers of any brand of wireless system that operates in the over-698 MHz range on its popular WMS 450 system. This rebate program gives customers a $100.00 instant rebate when they trade-in their “700-MHz” wireless system against the purchase of a WMS 450 from a participating contractor or retail dealer. A $100.00 mail-in rebate is available via a downloadable PDF form for new customers when purchasing the system from a participating online or catalog retailer.
Link to AKG.
Lectrosonics press release, via ProSoundNews.