When viewing a Product Idea you will see a "stage" status that identifies the current status of the Idea as indicated by PTC. 
Below are explanations of the various stages provided by PTC Product Management:
Open For Voting
This enhancement request may require more community votes or information and is still open for voting.
Under Consideration
Enough votes have been collected, Product Management has reviewed this Product Idea, but more information is required and the idea is still open for voting.
For Future Consideration
Enough votes have been collected, Product Management has reviewed this Product Idea and has marked it accordingly, voting has been turned off.
Current Functionality
Product Management has reviewed this Product Idea which matches functionality that already exists in a shipping version of the product, voting has been turned off.
Duplicate
Product Management has reviewed this Product Idea which matches another enhancement request previously submitted on PTC Community (link to duplicate idea provided in comments), voting has been turned off.
Implementation In Progress
Product Management has reviewed this Product Idea and is in the process of implementing in a future release of the product.
No Plans To Implement
Product Management has reviewed this Product Idea and has no plans to implement this feature based on the product roadmap or strategy.
Please note: While registered PTC Community members are allowed to view Product Ideas, only members with a PTC.com "Customer Account" are allowed to vote on Product Ideas. For more information on PTC.com accounts visit the Account Management page (login required).