WoTC Legal are probably not going to say whether they think specific elements in specific clones are copyright infringeing unless they are in the process of sending C&D letters/initiating legal action, because there is no advantage in doing so.
For their stated position, read closely the OGL:
(1) You can see that what they're concerned about is use of trade marks (and trade dress). To comply with the OGL you have to avoid even nominative & descriptive use of their trade marks & trade dress, things that would otherwise be legal.
(2) The OGL has a rectification clause - if WoTC think you're in breach of the contract, they have to send you a notification and give you time to rectify. They can't just sue you right out. This is very powerful and explains the popularity of the OGL, rather than jusy relying on the limitations of copyright law.
(3) The WoTC OGL FAQ explains that WoTC accept that game rules per se are not copyrightable.
From this, you can derive a view that it is very unlikely WoTC would sue Retro-Clone makers who are OGL compliant in terms of not using WoTC trade marks to indicate compatibility. But I think they are not likely to make a "We won't sue" statement because it could impact their ability to sue in edge cases, such as use of the OGL to make & sell 4e materials.
(I teach TM & copyright law in the UK).
For their stated position, read closely the OGL:
(1) You can see that what they're concerned about is use of trade marks (and trade dress). To comply with the OGL you have to avoid even nominative & descriptive use of their trade marks & trade dress, things that would otherwise be legal.
(2) The OGL has a rectification clause - if WoTC think you're in breach of the contract, they have to send you a notification and give you time to rectify. They can't just sue you right out. This is very powerful and explains the popularity of the OGL, rather than jusy relying on the limitations of copyright law.
(3) The WoTC OGL FAQ explains that WoTC accept that game rules per se are not copyrightable.
From this, you can derive a view that it is very unlikely WoTC would sue Retro-Clone makers who are OGL compliant in terms of not using WoTC trade marks to indicate compatibility. But I think they are not likely to make a "We won't sue" statement because it could impact their ability to sue in edge cases, such as use of the OGL to make & sell 4e materials.
(I teach TM & copyright law in the UK).