I don't think they're changing anything. Honestly I have to admit, I have never really understood Cherry's marketing system. In their Datasheets I've never seen any sign of the browns, while they seem to be pretty common in America and Asia. On the other hand the Clears, which always appeared in the Datasheets are really rare there. Here in Germany one can easily get a Cherry G80-3000 or G80-1800 with Clears, but none with browns, the same is for distributors like Mouser. As I said, it's confusing. (And please forgive me if my wordings are strange, it's 2:50 a.m. here, and English is not my mother tongue)