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You can read about the steps taken to in 5.0 and 5.1 which set the stage for this migration here:
Platform enhancements in 5.0 and 5.1

5.2 and Beyond -the next steps

The goal for 5.2 is to be able to migrate PlatformPlugins to Bundles. Several Jira cases have been created to encapsulate the work to be done in 5.2

BISERVER-11539 - Support the ability to provide Platform Plugins from OSGI
Our home-grown plugin system is limiting our ability to deliver compelling product…

BISERVER-11540 - Deprecate the IPluginManager as a Service Locator
Have the PluginManager register objects with PentahoSystem instead so we have a single point for service location.

BISERVER-11541 - IPluginResourceLoader needs to be modified to work with resources provided by OSGI Bundles
The ResourceLoader api is separate from PlatformPlugins and The IPluginManager but one that needs to be made to work with OSGI Bundles.

[MARKET-151 - The Marketplace needs to be updated to work with OSGI Bundle plugins|http://jira.pentaho.com/browse/MARKET-

BISERVER-11542 - Sample OSGI Bundles need to be written demonstrating PlatformPlugin-like behavior

BISERVER-11543 - A Type-Tracking system needs to be added to the Pentaho Platform API
As the new system allows PlatformPlugins and OSGI Bundles to be de/registered at runtime, we need a way to notify other areas of the system of the events.

BISERVER-11544 - PentahoSystem's AggregateObjectFactory needs to be updated to cache query results
Currently PentahoSystem.getXXX calls are not cached and query the underlying ObjectFactory implementations with every call. This can become extremely inefficient as the System grows.

BISERVER-11545 - The Pentaho Spring Extensions need to be updated for Spring 3.2.5 so they can be used within OSGI Bundle Blueprint files