The amount of honor being doubled is the level 60 post 2.3 value of 14.
The old system for prepatch honor kill calculation uses the 1.8 prepatch list and divides by 10. By changing the honor from 14 to 28…
Post 1.8 CP+ numbers divided by 10 was your prepatch HK number.
Patch 2.3 Numbers - 140 (14)
Rank 1 - 198 (20)
Rank 2 - 210 (21)
Rank 3 - 221 (22)
Rank 4 - 233 (23)
Rank 5 - 246 (25)
Rank 6 - 260 (26)
Rank 7 - 274 (27)
DOUBLE HONOR - 280 (28) We are here
Rank 8 - 289 (29)
Rank 9 - 305 (31)
Rank 10 - 321 (32)
Rank 11 - 339 (34)
Rank 12 - 357 (36)
Rank 13 - 377 (38)
Rank 14 - 398 (40)
Basically our kills are all going to count as though they are kills on people ranking between 7 and 8.
Honor for battleground objectives
Level 60 prepatch 14 multiplied by the objective value
Level 70 is 20.9 multiplied by the objective value
Double Honor prepatch is 28 mutiplied by the objective value
Both of these feel like it will be great news for prepatch, although the HK honor of 19.8 to 39.8 was something that existed in Original TBC into season 1 and 2, long after the prepatch is over.
In Classic TBC we will be using 2.3 values for Season 1 and 2. This means 14 honor at level 60 and 20.9 honor for level 70. We will also be using 2.4’s removal of the diminishing returns, so at least these honor values will stick.
Since we would be using season 3’s HK numbers, we should also be using Season 4’s “Honor Fix” which was reintroducing the repeatable quest “Concerted Efforts”.
Unlike the rep farm that existed the first time this NPC was added, the quest requires level 61 due to the quest needing EotS marks.
1 WSG, 1 AB, 1 AV, 1 EotS mark —> 314 honor honor repeatable
This puts the honor per mark at about 78, making each win essentially 235 bonus honor.
The changes will be fine for prepatch in my opinion, especially with the average rank of the players pushed down by those using the level 58 boost.
For season 1 and 2 we are using the 2.3 value of 20.9 honor per kill co-efficient for level 70. I remember the 2.3 honor values being kinda awful but we also had no diminishing returns in 2.4 too. Concerted efforts drastically rewarded wins in all 4 battlegrounds and that was pretty big. We are getting that IMMEDIATELY in season 1 instead of near the end of TBC if we are using the 2.4.3 reference server.
TLDR - I think we will be okay unless they disable the concerted efforts guy. Really wish we had the original 6 weeks of prepatch to play around in.