As we all know, the recent addition of the Battle Frontier in pokemon games follows a pattern. the first two games in the advanced generation, Ruby and Saphire, did not included Battle Frontier. firered and Leafgreen also lacked them, as they were remakes. Emerald pioneered the feature, which is basically an add on to the Battle Tower feature included from G/S (I think;never had those versions) through R/S. Diamond and Pearl saw to the removal of the feature, where only the Battle Tower is present. It finally reappered in Platinum, which unfortunatly for me, only my brother has (I didn't know that the BF was going to be reintroduced).
This leaves the question: Will Heart Gold and Soul Silver have Battle Frontier? Well, if this is anything like the remakes, probably no. However, there is a possiblity of two things. One, a future remake of Crystal will include the feature, or two, Nintendo will break the pattern and include the BF. A fifth generation is also possible, but not for a very, VERY long time.The second option also seems unlikely since the information that has been released so far does not seem to include the feature. Still, the advances being made are great, and I will definetely buy Soul Silver.
So, the verdict. Will the pattern be broken? Will Nintendo for the first time include the BF in a remake, or for that matter a two-version release? As for now, we can't be sure, but I will make updates when more info is available.
In the meantime, feel free to comment.