Update, November 3rd: the changes in prim allowances in full are now available in this post.
On Thursday, November 3rd, the Lab blogged about their latest Premium subscription offer for Second Life, and in doing so gave confirmation of the Mainland LI / prim allowances people had been noticing following the weekly deployments on Monday, November 1st and Tuesday November 2nd – and gave a tease for more news to come:
In regards to the latter, the blog post – Go Premium for 50% Off* & Enjoy Our Newest Perks Plus an Exclusive Gift – noted:
Premium members are entitled to a Linden Home and can own parcels on the Mainland. Now, we’re raising the limit on the number of prims you can use in those spaces. This means you will have more prims and creative flexibility to decorate and customize your own space. Land impact (object) capacity on Mainland Regions will go from 15,000 to 22,500 – that’s a lot more building capacity!
In addition to this, we will further carry the prim limit increases to the private estate regions shortly. Keep your eye on our blogs for more information!
An episode of Designing Worlds comes out later this afternoon which talks more in-depth about this new perk. We’ll update this blog once it’s available.
(My emphasis on the last part of the statement). All things being equal, I’ll also have more to come around 14:00 SLT see the link at the top of this article.

The rest of the post concerns itself with the Premium subscription offer, which started on Wednesday, November 3rd, 2016 at 08:00 SLT and will expire on November 10th, 2016 at 08:00 SLT. It offers the usual 50% discount – which for this offer is applied to the first month of the monthly subscription plan, as the small print explains:
TERMS & CONDITIONS This offer begins on November 3, 2016 at 8AM Pacific Time (PT) and expires on November 10, 2016 at 8AM PT. To qualify for this promotion, you must 1) have an existing Second Life (“SL”) basic account or create a new account, and 2) select monthly (every one month) billing for your SL account. The fifty percent (50%) discount will be applied to your first month’s bill and future months will be billed at the standard Premium Membership price (currently US$9.50 per month). For new accounts or accounts not previously upgraded to Premium Membership, after initial login through the Second Life viewer following upgrade to Premium Membership and: 1) following your first full week, the L$300 weekly stipend will be deposited to your account every Tuesday for the duration of your Premium Membership; and 2) after your account has been active for forty-five (45) consecutive days, the L$ sign-up bonus will be deposited to your account.
As well as the discount, Premium members are also offered a new gift in the form of a laser-shooting Alpha Robot Avatar.