I got back from our trip couple days ago and I'll share my experience.
1. Rider Switch now has return times & 1 hr window just like Fastpass.
2. People from group 1 CAN ride again using RS and you can bring up to 2 people with you (total 3) just like how it was before.
3. You CAN obtain more than 1 RS at a time. I had Soarin', RSR and GRR Rider Switch passes and had no problem using them all.
4. All RSs are now entered through the Fastpass entrances. I remember before it went digital, some rides like Space Mountain were entered through the exit if you had RS, but that's not the case anymore. Just keep in mind, FP entrances for rides like Matterhorn, Space Mountain and Indy can get REALLY long. We waited 10-15 min to the first check point of Matterhorn where you scan your RS/FP for the first time.
5. They "officially" allow you to use your FP/RS up to 5mins early (some CMs let us in 12 mins early despite the official rule) but if you have "multiple experiences" passes(I'll talk about this in a bit), do not use your FP/RS even a minute earlier than the exact return time. The system uses the multiple experiences pass instead of the RS which isn't good because
6. "Multiple Experiences" pass is a FP that's good to use anytime of the day you obtained it, and any rides with a few exceptions (DLP: Space Mountain, Peterpan, DCA: GotG, Some CMs told me RSR isn't part of ME pass but it appeared on mine and I used it at RSR with no problem). CMs gave out ME passes when rides broke down while you're in line, or you have a fastpass for the ride that broke down then it changes to ME pass automatically. And when I say it's good for any rides, it's including the rides that don't have fastpass, like Fantasy Faire, Alice in Wonderland and others.
7. Here's my thought on "abusers". The new system will surely stop people from using RS ANYTIME they want. However, when I was there, more than half of the CMs I talked to didn't even check if there was a group 2. I asked for RS and they just gave it to me because they were too busy instructing people on how to use the new digital fastpass system. Like I mentioned above, some rides' fastpass lines can get long and a lot of people didn't know how to scan their tickets right so CMs were busy with that.
My thought on the new RS is that it's not too bad after all but it requires a lot (more) of planning!! Sometimes, you have awkward 20 min gap between the time the group 1 is finished with the ride and your RS return time starts, that's too short to get in line for another ride around it but too long to just sit around and wait. So you gotta be creative with how to utilize your time, because time is gold, especially in
Disneyland
Side note: I do not recommend buying Maxpasses for DCA, buy it for DLR instead. I did it just so that I don't have to wait in line to get FPs for RSR and GotG. It wasn't worth it. You could easily get those FPs while waiting for Group 1 to be finished with rides. There aren't that many Fastpass rides at DCA and by 1pm, GotG and RSR FP is gone and you're left with very limited choices. Just not worth it.
*Attached file is a screenshot of ME pass and RS pass. So as you can see Multiple Experiences doesn't have return time as long it's used within that day, where Soarin has a return time. Also although it says Redeem "Fastpass" on Soarin', it's actually RS. They aren't any differences on the app but CM can differentiate on their devices. I know this because the incident mentioned in #5 happened and I had to go to the guest service to get my ME pass back and the CM THOROUGHLY checked what kind of passes we used at what rides lol