DVD mpeg-2 to Blu-Ray without re-encode?

[JLMTSTT]

I'm surprised at the difficulty I've experienced in finding an answer to this seemingly simple question, but I've had no luck in finding any answer online. I've seen multiple discussions with seemingly no resolution.

Can I take a DVD compliant mpeg-2 and author a Blu-Ray without re-encoding? I know Blu-Ray supports 720x480/576 (59.94i/50i) mpeg-2, the same as DVD, but there's often more to it than that.

I know that Blu-Ray does not support 704x480, although DVD does. So any 704x480 DVDs are not compatible with Blu-Ray without re-encoding. Also, I don't believe Blu-Ray supports mp2, although it does support AC3. How about progressive scan DVDs? Does standard def content have to be interlaced to be Blu-Ray compatible?

I'm not looking for specific software programs to allow me to author a Blu-Ray. What I want to know is if I'll be able to take the DVDs I create today and author a Blu-Ray sometime in the future without re-encoding.

If not, then how do I make standard definition material compliant with Blu-Ray specs. Are there any types of DVD-compliant mpeg-2 streams (aside from the examples I gave earlier) that are not Blu-Ray compliant?

Thanks