As we all know and love, the 1000 Series Access Points are no longer supported past 4.2. And I haven't quite heard the fate of the 1510 Mesh AP's either. However, I hate for this to prevent me from going to 5.X when the time comes right. Since I use Anchoring for Guest Access, and you are not supposed to anchor between 4.1 and 5.x I've come up with a "plan".
I'll leave all my 1000 Series and Mesh AP's on a 4.1 Mesh Controller and instead of anchoring the GUEST SSIDs to my DMZ Controller, I'm going to dump the WLAN to a Layer2 VLAN. On another controller at 5.x, I'm going to pick up this VLAN as a "Wired Guest". And then, I'm going to Anchor this to my DMZ Controller just like I do my Wireless Guest SSIDs.
In theory, any "Guest" users on the Mesh controller will dump on to the Wire in a VLAN that isn't routed, be picked up on the 5.x controller, be anchored to the DMZ controller, and dumped in to the DMZ like all other Wireless Guest Users.
I was waiting for 5.2 before I did it, but what do you think?