The following registry entries:
HKLM\Software\JavaSoft\Java Plug-in\1.7.0_02
HKLM\Software\JavaSoft\Java Plug-in\10.2.0
HKLM\Software\JavaSoft\Java Web Start\1.7.0_02
HKLM\Software\JavaSoft\Java Web Start\10.2.0
appears after previous family JRE removal
These "VERSION" registry entries are obsolete for 7 and should not be there, they lead to crazy behavior like unexpected old plugin usage
The entires are left after 7u2 removal
I can reproduce the issue using 7u4 b08 and preb09:
Install 6u31(b04)
Install 7u4 b08(preb09)
Uninstall 6u31
See 1.7.0_04 keys:
HKLM\Software\JavaSoft\Java Plug-in\1.7.0_04
HKLM\Software\JavaSoft\Java Plug-in\10.2.0
HKLM\Software\JavaSoft\Java Web Start\1.7.0_04
HKLM\Software\JavaSoft\Java Web Start\10.2.0

so fixes for CR 7088173(integrated in b08) and CR 7119192(which duplicates this bug, intagrated in b07) do not fix this issue completely.
But now these keys are removed after 7u4 uninstall.