According to the Thomsonfly website they use Boeing 767's with a seat pitch of 33". You have to watch tv on a screen which is a shame as they never give a decent picture and you are stuck with the one channel. Probably too late to upgrade seats as they sell out quickly. The cruise should be good though, we had a great time.
Don't bother with their upgrade. We have traveled premier on other airlines and found Thomson the worst. Not worth the money.