Hey, it appears you were right after all!
I sent an email to Treasure through their website's form. Of course I didn't expect any reply of sort, but I was amazed when I checked my mailbox and I found an email from Mr. Maegawa - sensei!!!
I guess this is what happens when you write to true gamers' developers, not some shit corporation that doesn't give a fuck about fans.
Since, well, the importance of this document is evident (a letter from Treasure's boss!) the least I can do for community is to post it below. I had to babelfish this and rewrite it in comprehensible english of course.
Greetings,
we read your email. Of course we're unhappy [with the] situation. Sega has become a bunch of westerners weaklings. They intend to sell out their legacy, but we at Treasure are against [this]. We think with years their spirit has weakened because of corruption, too much money from overseas market; they have forgotten roots and [put on] shame their ancestors.
We are in fact planning contermeasures. I will personally lead a commando of men and we will take the heads of Sega's traitors with our katanas. Our employee at Treasure are all descendant of strong samurai and we train at kendo every morning. We expect some casualties, but all of us are ready to do seppuku if taken by enemies. If everything else fails, we are loading a Zero plane (from Hiichi-san private collection) with explosive, and will launch it at Sega's headquarters.
I must also say to fans that we stopped production of gba Gunstar Super Heroes. We will never work with those cheaters again. We are searching for another partnership but this time we'll choose an american publisher. Japanese today are weak men they don't follow Bushido anymore. I spoke with McDonalds' Ceo and he comprehends Our concerns. He even complimented with me for my collection of wakizashi. Please look forward to our new all original content [game], Mc Donald Super Treasure Land for gba.
Regards,
Maegawa-san.
Well, what can I say more! At first reading it I was a bit sad because they quit the GBA gunstar

But Maegawa san words convinced me after all . He is a man of great integrity, he cannot stand this injustice! He opened my eyes, this port to shitty PS2 is a crime against humanity. I now feel guilt for doubting Treasure and thinking they were ready to bastardize their classics, but this is Sega evil plot. I pray that their raid will be successful and they'll take Sega's CEO head.
GO TREASURE!! FOR THE SPIRIT OF 68000!!! TIME FOR REVENGE!! WE FANS ARE WITH YOU!
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(just kidding, they didn't reply to me! I made this up. Tee hee!)