Hacker News Reader

Their focus has been on the mass production of starships, with one rolling off the assembly line about every 2 weeks now.

The next big milestones are SN15 launch (major upgrades in that version onward) and the booster launch (hasn't been tried yet).

They are hoping to get the 2 stage to orbit this summer, so probably after at least 4 more tests.

What happened to SN12, 13, and 14?

They were scrapped. SN12 had significant work on it before it was scrapped, but SN13 and SN14 only had a few pieces made before it was scrapped.

That link is the best coverage of the next flights SN15, SN16, SN17 and BN1, BN2, BN3. The aspirational schedule has been confirmed by Elon

They have another one (SN15, they skipped a few) in final assembly:

SN12-14 were cancelled due to them being based on the now-obsolete design used for SN8-11, right?

Yes