They really should be on the Season 4 set. The mobisodes were originally planned to be included in the Season 3 set, but due to contractual reasons with the various unions, they had to iron everything out (which is why we finally saw them before this season started).
I don't know what that term means either, so thanks for asking.
I own the first three seasons of Lost on DVD (7 + 7 + 8 discs); the eighth disc (for season three only) has about 15-20 minutes of 'extra' special features. I'd like to learn that these mobisodes are on one of those discs, but from what I'm reading here, they probably aren't included.
I'm surprised that people around here are not familiar with the term "mobisode". It is used to refer to very short episodes produced to be shown on cellular phone screens. They're like webisodes, only for cellular phones.
I'm sorry, but that is one of the dumbest ideas I have ever heard. Why on earth would I watch ANYTHING on my mobile phone screen? However, I agree that they should be on the DVDs if they contained any additional footage.
I have no interest in watching anything cellphone either but it was also available online and, most likely, they intend it to be on the S4 DVDs. In the end, the only difference I see between the mobisodes and the actual episodes is the length and the place where it was originally shown.
I don't have a Verizon mobile phone, so I'm glad they decided to make it available online. ABC.com put up one each Monday leading up to the season four premiere. These never made into the series and they are as well-written, produced, and acted as the series.