Looking at http://docs.composite.net/Configuration/Creating-C1-Packages , it appears that packages can target specific versions, so it might be worth the C1 team creating two versions of Composite.News, one for:
<mi:PackageRequirements minimumCompositeVersion="4.1.0.0" maximumCompositeVersion="4.2.9999.9999" />
... and one for:
<mi:PackageRequirements minimumCompositeVersion="4.3.0.0" maximumCompositeVersion="9.9999.9999.9999" />
... with the latter omitting ~\App_Data\Composite\DynamicTypeForms\Composite\News\NewsItem.xml
<mi:PackageRequirements minimumCompositeVersion="4.1.0.0" maximumCompositeVersion="4.2.9999.9999" />
... and one for:
<mi:PackageRequirements minimumCompositeVersion="4.3.0.0" maximumCompositeVersion="9.9999.9999.9999" />
... with the latter omitting ~\App_Data\Composite\DynamicTypeForms\Composite\News\NewsItem.xml