After awaiting a response from BlackBerry I have heard nothing so it is not confirmed that this will fix every issue with BlackBerry 10.2 devices and WebViews however it sure has resolved my issue.
The WebView appears to render incorrectly due to hardware acceleration being enabled on Android to BlackBerry applications, the solution to this problem is to disable hardware acceleration in one of two places.
if (Build.BRAND.equals(BLACK_BERRY))
{
webView.setLayerType(View.LAYER_TYPE_NONE, null);
}
Assuming that you have a WebView that is defined as webView, else deactivating the setting in the Android manifest for the entire application is also a feasible solution.
<application
android:hardwareAccelerated="false"
This either one of these should solve the issue with the WebView.