Model 3:
End of Q1/early Q2: Peak rates of 2,5k/wk hit. But not average rates, due to line downtimes.
End of Q2/early Q3: Peak rates of 5k/wk hit, but again, not averages
End of Q3/early Q4: Line 2 starts making its first vehicles. Line 1 has overwhelmingly stabilized at 5k/wk
End of Q4/early Q1: Line 2 stabilizes at around 5k/wk.
Total production: ~200-230k
All major variants introduced at some point this year with the possible exception of overseas variants (e.g. EU-spec)
Most of the major non-autopilot software wishlist has been taken care of - TACC adjustment on the steering wheel, more functionality for the right steering wheel control in general, etc - done. But lots of minor ones remain. The new nav system deploys to all Teslas in Q2.
Model Y: Unveiled at some point in Q3, with a surprisingly quick production timeframe planned. Also unveiled: plans for a major expansion of the supercharging network. Probably at least one other unrelated product or feature announcement at the unveiling.
Semi: You'll be seeing a lot of them on the Sparks/Fremont route
Production line progress will be very limited this year, as their initial orders are just trial orders, and thus comparably small; automation will only be used in the start for labour-intensive components. They need to ramp in 2019-2020 to transition trial orders to major fleet buys.
Model S / Model X: I believe a refresh is already in progress using a stretched Model 3 platform, although it won't be unveiled until the last minute in order to not cannibalize sales from current sales, probably not until perhaps Q1 2019. I used to not think they would do this, but recent evidence - a lack of desire to increase orders on 18650s, and the hacked power specs on the battery showing that a stretched version should be more than capable of ludicrous mode - have changed my opinion. Model 3's handling and the new motors' performance without throttling should make the refresh amazing and lead to an order surge.
Also, Tesla has hinted about new options and features for Model S and X to be unveiled this year. So, most probably Q3-Q4 for those.
Autopilot: I'm a doubter about FSD in general, but I expect major improvements in AP quality this year, including the fabled onramp to offramp functionality.
Energy: Massive year-over-year expansion in commercial orders. Continued strong growth in residential orders. Tesla will struggle to keep up with both.
Solar: The new solar roof products continue to be deployed, increasingly to customers, but continue to be very much production limited. Orders will surge, creating a huge backlog.
Megachargers: First demo megacharger station unveiled in Q3/Q4.
Roadster: More sightings. More test drives for the lucky few. A number of teasers. But no really big "news".
Pickup: I want to believe that we'll hear something significant about it later this year, but I really don't know.
Big surprises: At least one. Come on, we know by now to expect the unexpected
