So far I'm liking the new book. There seems to be little that at first glance is over powered though I can hear the cron-air players weeping now that all battle suits can buy sky fire.
I think giving more units the option to sky fire will definitely balance the game for those who do not have flyers. For example something as simple as saying you can give this unit a HW with skyfire will make the game better for those who either do not own flyers or do not have the ability to use flyers for their armies since they haven't been made. What I do think GW should do is bring out a supplement in white dwarf which updates at least one unit for each army to have the ability to skyfire, rather than making everyone wait for their updated codex.
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For example something as simple as saying you can give this unit a HW with skyfire will make the game better for those who either do not own flyers or do not have the ability to use flyers for their armies since they haven't been made.
What I do think GW should do is bring out a supplement in white dwarf which updates at least one unit for each army to have the ability to skyfire, rather than making everyone wait for their updated codex.