There will be no silicone tips for these AirPods "3" if we are to believe these leaks: It quite clearly shows the same type of speaker grill and tapering between the white plastic and the speaker itself that we see on the non-Pro, regular AirPods 1 and 2.
Conversely, AirPods Pro are much flatter in the same area and the speaker itself and the white plastic is shaped to accommodate the silicone tips, and a little part of the speaker grill actually sticks out further than the plastic body when seen in profile view.
Since there are no indents or "holes" to plug in a silicone tip, they would instantly fall off. I don't see Apple selling silicone tips for these at all. 3rd parties might try to make some, but Apple will not sell ones.
Key features I predict for AirPods "3":
- Improved sound
- Improved call quality
- New "H2" Bluetooth chip featuring (Class 1) Bluetooth 5.2 *Quite likely might just be the same Bt 5.0 H1 from AirPods Pro to cut costs
- Same mAh battery as in AirPods Pro but greater battery-life overall due to the lack of high-end (battery-draining) features like ANC, transparency mode, multi-directional mics, etc.
- Pairing and switching between devices could be improved but only with a new "H2" chip.
- All technology and features related to ANC will be cut
- No silicone tips, no in-ear design. 3rd parties will try to make tips, but Apple will not sell ones for this model.
- Lower than $249 launch price. Could very likely be $159 or $199 since these will most likely replace regular AirPods 2 in Apple's headphone line-up. But I don't see anything lower than $149. $199 is my best bet since these have to have some kind selling big point over getting soon-to-be-extra-discounted AirPods 2.
- One model, one color option (standard, white)
- Exact same specifications for Qi charging and charging ports as AirPods Pro.
- Same charging case as for AirPods Pro but without the extra room for silicone tips.
- No spatial audio with head tracking
- Same sensors and microphones as in AirPods Pro except for those related to ANC.
- Same pinch stems or summon Siri controls.
- Same IPX4 rating as seen in AirPods Pro.
*I only see Apple doing a new Bt 5.2 "H2" chip for these if they also launch a new iPad (Pro) with Bt 5.2 at the same time, as all currently available Apple devices only go up to Bt 5.0.