I've owned my coach for four years. Since I use the Oasis diesel burner sparingly on mine (live out west), I've decided to do the service every two years. The first time I did the service it came with an old style air filter (it looks like an inline fuel filter found on motorcycles years ago).
The new service kit, that I used today, came with one of the bronze (pumice surface) air filters. Initially, I looked at the thing and tried to figure out where the heck it went. Eventually, my brain cells clicked and I realized it was the new style air filter.
Many may have already figured this out because they've serviced theirs more frequently, but this was the first time I saw the new style filter.
The first photo is the old style. The second is the new style and the third is the new style installed.