This question, or similar ones, have been answered a few times before in the TelePresence section.
If I can find the thread references, I'll add them here, but a search there should find the discussions.
Yes, you can go straight from TC3 to TC7, but it has been suggested that an intermediate step can help with possible touch panel and/or camera firmware upgrade issues.
From memory, the suggested upgrade path was TC3 -> TC5 -> TC7.
Edit: Here's a similar reference for the EX90/touch panel issue: https://supportforums.cisco.com/message/4138656#4138656 showing the 3 -> 5 -> 7 path.
Wayne
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Wayne
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