I originally owned DX for less than a week when it just came out but returned it because I couldn't live with its constant restarts and low ringer volume.
I was told that Froyo will address those problems.
I would like to ask two questions about those matters:
1. Are current DX users that upgraded to 2.2 see any improvement in the ringer volume (I read some conflicting reports from different users on this blog) and is the issue of the restarts was addressed?
2. Does anyone know if future ordered DX will be automatically with 2.2 or is that would have to be downloaded through OTA upgrade?
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To answer the first half of your question, Yes
They have increased the speaker volume considerably. I can now hear my phone ringing from across the apartment. I would say its comparable to a Droid 1 volume wise
As far as future devices shipping with 2.2 preloaded, I do not know