1)
Why did the king tell all this?
1.
Ibn Ezra: It was for the honor of Daniel. He wrote this to all Medinos of his kingdom. It was a great honor for Yisrael.
2)
Did he command Chachmei Bavel to come to him?
1.
Malbim: No. Until now, they were distanced from him. He considered them like Chayavei Misah [for not telling his first dream]. Now he permitted them to come in front of him.
