Believe it, don't, that's up to you. Going off some inside info from a source that's been reliable to me in the past.
RELEASES:
iPhones
- 7S, 32GB/128GB/256GB, Starting at $649
- 7S Plus, 32GB/128GB/256GB, Starting at $769
- Edition, 64GB/256GB/512GB, Starting at $999
- No SE update at this time. iPhone 6 and SE remaining as current prepaid options.
Processor, and slight camera improvements to 7S/Plus. 3GB RAM on both 7S and Plus models. Faster processor on Edition model. Wireless charging across all models. Same screens from 7 range on 7S/Plus. Improved screen on Edition. Edition to feature facial recognition for unlocking, as well as a sort of "always on" type display feature.
Tablets
- No new releases
- Quiet removal of Mini 4 post Keynote update
- Sales numbers touted heavily
Not much to see here, due to the recent refreshes. Mostly touting numbers and the recovery of the platform without saying things like "recovery" or "We almost really screwed up here". Mini removal is likely at this time.
Watches
- S3. Minor spec bump, new LTE model, starting at $369 on Non-LTE.
- S2 price drop, remaining for sale, starting at $269
- S3 Metallic finishes to match iPhone Edition.
- New S3 Edition model with lower price than Ceramic S2
Overall minor refresh. No immediately apparent external changes, though the measurements will change slightly on the S3 models, similar to S0 to S2. LTE models to be promoted heavily via carriers, but will still require an iPhone to take full advantage of features. $5/mo line access for most carriers on LTE model, but possible incentives when linked with an iPhone through the carrier (on a payment plan) as well. Worth noting, this section of the event may be delayed until the Spring event based on external factors, but the updated watches are currently prepared to launch. S1 watches may receive a further price drop, but more likely will be discontinued.
Macs
- iMac Pro highlighted, firm release date given w/ preorder date as well
- No Mac Mini at this event
- No Mac Pro at this event
Not much to see here either. Small mention, sales touted, etc.
Apple TV
- New 4K model, Starting at $199
- Non 4K model will *potentially remain* at lowered price
Not a whole lot here, but a big release for some that have been waiting for 4K support. Info wasn't clear on the current generation Apple TV, but it seems it will potentially remain with a slight price cut. 4K model will receive a faster processor as well, but not much beyond that and 4K. Design to be the same.
HomePod
- Highlighted again, but more briefly
- Release date announced, along with preorder date
Mostly just a "wrap up" from the WWDC announcement. Expect this section to be brief.
Software
- iOS 11 release
- watchOS 4 release
- macOS High Sierra release
- Integration features highlighted, some brief demos
The usual here. Nothing surprising, and the brief demos may be cut for time, based on other announcements.
Accessories
- New cases and case colors for 7S, 7S Plus, Edition
- Wireless charging accessory/dock, starting at $99
- New watch band colors
All the usual and expected here. No smart connector iPad accessories at this event.
That wraps it up. These predictions will remain unedited until after the keynote, at which point I will edit strictly to point out accuracy of each prediction, as well as to add an overall accuracy rate to the post. Source will remain unnamed to to sensitivity of information, and requests for information on this source will be ignored.