BlackBerry 10 will bring a new set of features to BlackBerry Messenger, although it will remain compatible with the current version. One of the new features is called the 
BBM Recommended contacts tab and it provides you with a list of names from your contacts list that have BBM, Keep in mind that you won't be able to see any PIN numbers, but you will be able to invite anyone on the list to chat. It's similar to a feature on the 
BlackBerry PlayBook video chat app which shows you which of your contacts has the app so that you can engage in,well, video chatting.
RIM is saying to expect a number of changes to BBM with BlackBerry 10. The 
official introduction of BB10 is set for January 30th. Meanwhile,  RIM's shares continue to move higher as investors are voting with their cash that BlackBerry 10 will be a major success. The stock has nearly doubled off of lows made during August and September.
source: 
BerryReview
                        
                        
                        
                        
                        
                                                    
                                                                         
                    
                    
                    
                    
                    
            
            
                            
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