Looks like the original 2ce Signature will not be discontinued. Here is a Q&A from the Vandersteen website:
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John (12/18/06): Around August I purchased the 2CE signatures new and would like to know what options I have to upgrade them to the 2CE signature II?
Answer: HELLO JOHN, THE 2CE SIG WILL CONTINUE AT $1545.00. IT WOULD BE WAY TO EXPENSIVE TO UP-GRADE ALL THE COMPONENTS CHANGED IN THE 2CE SIG II. THE PRICE OF THE 2CE SIG II IS $1995.00. IF UPGRADEABILITY IS AN ISSUE I SUGGEST YOU LOOK INTO A PAIR OF 3A SIG'S WHICH ARE UP-GRADABLE
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John (12/18/06): Around August I purchased the 2CE signatures new and would like to know what options I have to upgrade them to the 2CE signature II?
Answer: HELLO JOHN, THE 2CE SIG WILL CONTINUE AT $1545.00. IT WOULD BE WAY TO EXPENSIVE TO UP-GRADE ALL THE COMPONENTS CHANGED IN THE 2CE SIG II. THE PRICE OF THE 2CE SIG II IS $1995.00. IF UPGRADEABILITY IS AN ISSUE I SUGGEST YOU LOOK INTO A PAIR OF 3A SIG'S WHICH ARE UP-GRADABLE