There sure hasn't been any news in awhile...
This will be a mixture of both good and bad news, and I'll briefly discuss my opinion on the fate of the series and address other fans' concerns.
Sengoku BASARA Character Popularity Poll 2020

CAPCOM held a character popularity poll for the Sengoku BASARA series on the BASARA CLUB site from November 9, 2020, to November 20, 2020. A live stream to announce the poll results happened on December 13, 2020. There were a total of 64 characters to vote for. Voting required being a member of the BASARA CLUB. Members were able to vote for their top 10 characters once per day, with every rank adding a certain amount of points to the tally. Once the results were announced, the overall top 10 characters, as well as the 20th, 30th, 40th, and 50th ranked characters, will feature in new merchandise. There will also be a joke prize for the 63rd-ranked character. Watching the poll results live stream required purchasing a ticket from the site. Purchasing a ticket required either being a member of BASARA CLUB or having a Rom Mall account. The live stream featured Kōji Okino (the current stage play actor for Ishida Mitsunari), Yūsuke Seto (the current stage play actor for Akechi Mitsuhide, and Tenkai), and Hideto Mashima (the current stage play actor for Date Masamune). Merchandise from this poll will be sold on the BASARA CLUB site for members to purchase.
Good News and Bad News
The good news is that there is a new official poll for the series. There hasn't been one for a few years (I'm pretty sure the last one was in 2016). Also, this gives a chance for the 3 new characters that were added through Sengoku BASARA Battle Party (Izumo no Okuni, Katō Kiyomasa, and Komatsuhime) to be featured in new merchandise. This also gives the female characters (they don't really feature in much merchandise, as most of the male characters tend to be more popular), and/or unpopular characters (of course, if they're not popular enough, they won't feature in most merchandise) a chance to feature in new merchandise. The bad news is that this is the first time an official poll for the series is limited to BASARA CLUB members, as previous polls were open to the public. Also, previous polls had their results published in magazines and on websites, but the results for this poll is on a live stream, and requires purchasing a ticket to watch. Another thing is that I already have a feeling as to who made it into the top 10, and some of the characters that I feel should receive more merchandise (Ashikaga Yoshiteru, Azai Nagamasa, Ii Naotora, Matsunaga Hisahide, Oichi, Saika Magoichi, etc.) might only have a chance through the 20th, 30th, 40th, and 50th spots.
The Fate of Sengoku BASARA
Before I discuss my opinion on the fate of the series, I'd like to briefly go over on how the games have been. The latest game in the series is Sengoku BASARA Sanada Yukimura-den, which was released for the PlayStation 3 and PlayStation 4 in Asia on August 25, 2016. CAPCOM also released Sengoku BASARA 4 Sumeragi: Anniversary Edition for the PlayStation 4 in Japan on July 21, 2020, to celebrate the series' 15th anniversary. Sadly, it's just a re-release of Sengoku BASARA 4 Sumeragi with all of the DLC included, and CAPCOM hasn't decided to try releasing it for the Nintendo Switch despite fan demand. The series’ mobile gacha RPG, Sengoku BASARA Battle Party, released in Japan on June 24, 2019, and was shut down on December 21, 2020. Luckily, the series was added as cards into CAPCOM's mobile card game, TEPPEN, worldwide on October 1, 2020. Honestly, I feel like the series is very much on the verge of death, and a lot of fans feel this way too. Ever since the announcement of the SB BP shutdown, most fans have just been losing all hope for the series, whereas before, most fans have had very little hope for the series. A possibility of a Sengoku BASARA 5 happening (or just a new console game in general) seems extremely unlikely, especially since CAPCOM had the SB team shut down SB BP. Who knows what the series' future holds, but for now, we can just enjoy the fact that the series is in TEPPEN, and that there's still that manga that started with its first chapter on December 1, 2020.