Here is some of my opinions on the proposed GvG changes...
Additional Recalc Timers (4hr): This is essentially going to make it impossible for most guilds to sustain keeping enough tiles to keep them in 1st. I am assuming that's the point of the change. Not many guilds will bother trying to fill many tiles anymore, because in off hours when most are sleeping a few ghost guild players in other countries will just come on and wipe you out easily when your guild is mostly sleeping, or people that don't work will take tiles when most of the world is working. You are taking most of the actual strategy out of GvG that we have now on organized times to strategicly plan around to keep maps safe day to day. Some will adjust to the changes, but you are going mostly anger many guilds over this major change, and likely lose a lot of diehard GvG players that will quit the game over it (many of which are your big spenders that take GvG seriously).
Removal of Bronze units: I'm ok with this change, as it makes filling AA a little harder on time on cooking troops, versus seconds with spears.
Reduce point farming profitability: With the change you are making, that will now allow people to cook iron troops rather quickly compared to higher eras (as well as low era players making these as well), drop the tiles, and have them automatically convert to Space Troops which will net a large amount of points for people to point farm as usual. Except this is even easier now, as most are using Champs/Rogues currently with a lot of unattached troops they got via Traz because they can't produce them quick enough in their city due to large production times, and now you are allowing people to make iron troops easier and convert to Space anyway. Sure the random space troops aren't as high of value as champs, but they certainly net a lot of points, and Iron barracks take way less space and most will cost the users nothing unattached, increasing the point farming capability. So this change overall will do exactly opposite of what you are trying to accomplish by reducing point farming. There is no reason that i can see, on why any era troop should be upgraded to highest value on the map, helping point farming out upon being dropped. If anything, make any DA's randomized in any era upon being dropped (like 1 SAM, 1 CE, 1 EMA, 1 PME, etc), to where the result is inconsistent and unpredictable to make point farming not viable off it. Making champ values the same as the rest of the SAM troops would be a good start on people champ farming, as there is no reason a Champ should give more points than any other unit anyway. Another suggestion would be if you take an NPC (unclaimed) tile, the points inside the tile give you 1/2 the value, or even 1/4 the value per victory, as you would usually get if it was an actual guild you take the tile from. That way it will have much less value and desire for people to drop/retake their own point farming tiles.
Confirmation checkboxes: This is a very positive change, to prevent all the rulebreakers from sieging/filling tiles quicker than the game was intended by means that you have gotten many complaints about across the world.