This is what is changing in a nutshell. The old wideband channels with 127.3 tone will not be used after Dec 31, 2012 due to narrowbanding. The standard nationwide channel plan will be implemented with two Texas-specific frequencies.
TEXAS AIR 2 is removed from the plan.
VTAC33 - VTAC38 added to the plan. These are the VHF temporary repeater channels that were added to the national channel plan a couple years ago.
Texas Law 1 and Texas Law 2 will be reconfigured to TEXTAC01 and TEXTAC02. Apparently mobiles will now talk to base stations on 155.370.
TEXTAC01 will be a mobile-to-mobile calling channel.
TEXTAC02 will be used as a Primary Aircraft Calling Channel between state/federal aircraft and a base station. It also will serve as a backup to VCALL10 as a calling channel. The national narrowband interoperable channel, VCALL10, will be primary over TEXTAC02 as a calling channel.
Old Wideband Ch Freq Tone --> New Narrowband Ch Freq Tone
TEXAS LAW 1 154.950 CSQ --> TEXTAC01 154.950 156.7
TEXAS LAW 2 155.370 CSQ --> TEXTAC02 155.370 156.7
TEXAS LAW 3 155.475 127.3 --> VLAW31 155.475 156.7
TEXAS FIRE 1 154.280 127.3 --> VFIRE21 154.280 156.7
TEXAS FIRE 2 154.265 127.3 --> VFIRE22 154.265 156.7
TEXAS FIRE 3 154.295 127.3 --> VFIRE23 154.295 156.7
TEXAS MED 1 155.340 127.3 --> VMED28 155.340 156.7
This is a draft document so things could change. Keep an eye on the web sites in the first two posts for the final version.