Yes, even I agree the line releases have gotten slowed down, but at least we're getting as many figures this one year alone as we've gotten so far.
Volume 1 Ernie, December 2024.
Volume 2 Bert, January 2025.
Volume 3 The Count von Count, March 2025 as 2025 Target Haulathon.
And in 2026 we've gotten Volume 4 Super Grover, and Volume 5 Big Bird and Oscar The Grouch if he's to be next as Volume 6, with the potential of Herry and maybe Sherlock Hemlock by the end of the year.
As for SDCC, now that it's three weeks away... My hope is that Big Bird does get released before the convention, that way they'll have latest release product in hand to show/sell there directly. My thoughts are, and there's no hard evidence this will be the news we get, is a showing of final sculpt for

and in-progress sculpts of the other figures we know of for the Sesame Street line. Plus if they say

is Volume 6, it makes sense to me he'd be released in September so they again have latest released product in hand to show/sell at the NYCC in October.