I'm afraid that Infopath 2007 and Publisher 2007 don't have a compatible replacement at all on an iPad, while they surely are part of MS Office 2007. So the answer to yoiur questiion about a full replacement is no. Also, support for ActiveX extensions is very doubtful. That's another reason to say no.
I'd wait a few month, then buy a full Windows 8 tablet and install the full MS Office on it.
Is there any IPAD application will support to edit with complete features of Microsoft office files