As far as I know there are no HDTV cameras available at the moment... existing prosumer cameras like Canon XL series already capture material at a higher resolution than is transmitted...........
The move to HDTV is likely to be driven by the satillite companies (its rumoured SKY in the UK are going to start broadcasting some test programs) As a starting point suggest u look at post production systems, and see what they're saying about hdtv output.....
btw... we currently post our video material as mpeg2, for quality reasons... has great quality but problems in people downloading it and playing it... any suggestions???
Gawdi
www.maturemeansmoney.com
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