Getting an "open" channel but a greyed guide is a "thing" with the 6xx receivers.
I believe H2 and H2 HD are in free preview.
On other things:
Rural is already there.
ADV vs Classic is just what version of the channel number list you get.
The new HD lineup (includingexisting channels) begins at channel 1 on classic, and 501 on advanced. Channel 1/501 is BC News HD.
You should be able to get all channels with either. If you don't, you have the wrong V-code, not upgraded the LNBF, or are out of the G1 footprint.
Duplicated channels are just the same channel with two or more channel numbers, not them getting transmitted twice, so no bandwidth is wasted. Yes, they could at one point discontinue the old HD channel lineup and map new channels there, should they have bandwidth to add new channels, or other factors.
5xx receivers are getting the same new guide, less the new channels in MPEG4. I don't know how PBS-B is to fit in, but should stay in its current spot on either Advanced or Classic lineups, if it is to stay at all.
Currently existing F1R/F2 satellite usage is status quo - full up.
The added channels and revamped guide (which includes new and existing channels) have no impact on that. Somebody will need to analyze G1 transponder usage to see what more can be added, and what can be added if existing MPEG2HD are converted to MPEG4, and MPEG2/QPSK SD channels/transponders used to their full potential.