Many-to-Many table mapping in EF CTP5

Was just reading that the method of many-to-many mapping is different in CTP5.  Here’s the method:

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public ICollection<Store> SoldAt { get; set; }
}
 
public class Store
{
    public int Id { get; set; }
    public string StoreName { get; set; }
    public ICollection<Product> Products { get; set; }
}
 
public class MyContext : DbContext
{
    public DbSet<Product> Products { get; set; }
 
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
 
    modelBuilder.Entity<Product>()
        .HasMany(p => p.SoldAt)
        .WithMany(s => s.Products)
        .Map(mc => {
            mc.ToTable("ProductsAtStores");
            mc.MapLeftKey(p => p.Id, "ProductId");
            mc.MapRightKey(s => s.Id, "StoreId");
        });
}