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It's been reported that the February 2012 ARRL QST magazine will include the CSQ reporting system, designed to replace RST and apply to all modes.

The following was published online by Bruce N7RR.

C or Copyability

N = no recoverable signal*
0 = discernible but not copyable*
1-9 = 10% to 90% copy
G = Good 100% copy, but short of perfect
P = Perfect armchair 100% copy or full-quieting on FM

S-Meter or Signal Strength

0 = no S-meter reading
1-9 = S-1 to S-9
A = 1 dB to 10 dB over S-9
B = 11 dB to 20 dB over S-9
C = 21 dB to 30 dB over S-9
D = 31 dB to 40 dB over S-9
E = 41 dB to 50 dB over S-9
F = 51 dB or more over S-9

Quality

X = characteristic steadiness of crystal (Xtal) control or eXcellent quality
R = AC Ripple or buzz in transmission
C = Chirp or tail on make and/or break
K = key clicKs or other Keying transients
O = Overmodulation or Overdeviation in phone or digital modes

* For Copyability reports of N or 0, no Signal Strength or Quality reports are needed.

Examples:

P6O = for a PSK-31 signal: perfect 100% copy at S-6, but overdeviated
93X = for a CW signal: 90% copy at S-3 with excellent quality
G7O = for an SSB signal: Good but less than perfect 100% copy at S-7, but overmodulated
PAX = for an RTTY signal: perfect 100% copy about 10 dB over S-9 with excellent quality
P6X = for an FM signal: full-quieting 100% copy at S-6 with excellent quality

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