So I ended up calling the dealership to verify. According to them, the two filters are "interchangeable" and Subaru recently made the change due to "supply issues" with the Rokis. There was no indication that the Rokis are obsolete or have actually been replaced. They seem to still be available upon request from most dealerships. Both filters are listed on the websites for all dealerships with parts estores that I checked, and interestingly enough, practically every online source of the Rokis seems to be a dealer (including the ebay link posted earlier in this thread, which seems to have upped their price after the publicity). If you are looking to stock up, I suggest checking the estores of a few local dealerships. Some allow pickup and have pricing as low as ~$5.50 for the Rokis, which is a decent savings over the e-bay link, which has subsequently become $45.87 with shipping, or $7.65 each, almost the $7.85 retail price.