Only because the Trailblazer/Envoy are in their first year of production of an all new head to toe vehicle - I think it's reasonable to expect some level of problems (first model year woes).
You'll notice on the Av that most of the early complaints were on Avalanche specific systems, with exception to oil burning issues on early production models with 5.3 engines out of Canada - but that was a GM product wide issue. This is largely because 85% of the Avalanche parts came out of the tried and true product bucket for the Suburban.
Prediction - 2003 Avalanches will have an increase in the number of interior issues - only because the new interior components being added in their first model year and the increased level of complexity...