I've done something with collections that might interest you with regard to this.
For a long time now I've wanted my guide to list our most used channels at the top and then all of the rest. So, now with collections I've done that. I created a channel collection called 'Everything' in it I have 8-10 channels that are listed at the top of our guide which is then followed by the remainder of our channels in alphabetic order by channel name. This collection is our default guide.
How does collections help with new Pluto channels? As each channel is added to a collection it is then grayed out in the list. This means that whenever Pluto or any other provider adds a new channel it is not grayed out in the list. So, a simple visual scan every now and then of that collection looking for non-grayed out channels shows me what was recently added.
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